readme: add range-plot example + output-path scheme (map.png, range_<vector>.png); two plotting fns

Co-Authored-By: Claudypoo <288921227+claudypoo@users.noreply.github.com>

README.md

@@ -9,8 +9,21 @@ runs many questionnaires; the default is the Clifford moral-foundation vignettes
 The map places 19 human societies (grey, MFQ-2 means from Atari et al. 2023) and a local model
 (baseline plus steered poles) on the same relative-emphasis axes. The question the repo is built
 around: where does a model land relative to human cultures, and can we steer it across that space.
-This figure is produced by the downstream map step (moving into this repo); the engine here
-produces the per-model profile it plots.
+
+![Steered MFQ-2 profile range per steering vector vs the human envelope](docs/img/range_mfq2.png)
+
+The range plot is the second view: each steering vector's c-sweep (blue = negative pole, red =
+positive) over the grey human cross-cultural band, per foundation. It answers "does any steer push
+a foundation outside the human range" at a glance.
+
+These two are the engine's whole output surface, produced by exactly two plotting functions
+(`plot_ipsative_pca` and `plot_range`). The images above are example outputs (MFQ-2, regenerated
+each run; the maps move into this repo from the steering experiment). Output paths:
+
+```
+figures/<instrument>/map.{png,svg}             # ipsative PCA culture map (all vectors on one map)
+figures/<instrument>/range_<vector>.{png,svg}  # c-sweep range, one per steering vector
+```
 
 ## Quickstart